Figure 5.

Parallel-to-interface refraction (PIR) and vortex-like modes in inverted pyramid photonic crystal with H = 5 μm and a = 1800 nm: (a) Magnified absorption spectrum of the cell over the 850–1200 nm wavelength range. The red circles correspond to the resonances at λ = 1110,1130 and 1176 nm. (b), (c) and (d) Yellow arrows show the in-plane Poynting vector flow over the central xz-plane of the inverted pyramid PhC unit cell at λ = 1110, 1130 and 1176 nm, respectively. Such long lifetime modes are responsible for the high absorption even in the 1100–1200 nm wavelength range, in sharp contrast to Lambertian and planar cells.